docs: def remove_edges_from(self, ebunch):
          """Version of remove_edges_from that's much like normal networkx but only
          deletes once, since the database doesn't keep separate adj and
          succ mappings
  
          """
          for e in ebunch:
              (u, v) = e[:2]
              if u in self.succ and v in self.succ[u]:
                  del self.succ[u][v]